JP2019509975A - 超常磁性ナノ複合体の製造方法およびこれを用いて製造された超常磁性ナノ複合体 - Google Patents
超常磁性ナノ複合体の製造方法およびこれを用いて製造された超常磁性ナノ複合体 Download PDFInfo
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Abstract
Description
アイアン(III)クロライドヘキサハイドレート(FeCl3・6H2O、ACS reagent、97%、MW=270.30)、トリス−ソジウムシトレートジハイドレート(HOC(COONa)(CH2COONa)2・2H2O;C6H5Na3O7、99%、MW=294.10)、ソジウムアセテートアンハイドラス(C2H3NaO2、MW=82.03)、エチレングリコールアンハイドラス(C2H6O2、99.8%、MW=62.07)はSigma−Aldrich社(St.Louis、MO、USA)から購入し、ジカルボキシルポリ(エチレングリコール)(PEG−diacid;polyethylene glycol diacid)(COOH−PEG−COOH、MW=2000)はJenkem Technology社(Beijing、China)から購入した。超純水ウォーター(nanopure H2O;>18.0MΩ)はMilli−Q water purificationシステムで精製した。
実施例1の磁性ナノクラスタ形態の超常磁性ナノ複合体(具体的には、超常磁性酸化鉄ナノ複合体)は、図1に示された方法で合成された。
実施例1の磁性ナノクラスタ形態の超常磁性ナノ複合体(具体的には、超常磁性酸化鉄ナノ複合体)は、図1に示された方法で合成された。
1−1.走査電子顕微鏡(SEM、Scanning Electron Microscope)による超常磁性ナノ複合体の形状の観察
前記実施例1および実施例2の超常磁性ナノ複合体を、走査電子顕微鏡(SEM、Scanning Electron Microscope)(S−4700、Hitachi、Tokyo、Japan)により大きさおよび形状を観察し、その結果を図2に示した。
実施例1および実施例2の超常磁性ナノ複合体のサイズ、分布度および表面ゼータ電位は、動的光散乱粒度分析を利用するゼータサイザー(Malvern社、モデル名Nano ZS)を用いて測定した。
本発明に係る実施例1および実施例2の超常磁性ナノ複合体が、超常磁性特性を有しながらも高い磁化度を有して磁気分離用に用いられるための優れた分離力を有するかを確認するために、超伝導量子干渉素子を用いて磁性度測定を行い、その結果を図7および図8に示した。図7および図8は、超常磁性ナノ複合体の磁気履歴曲線(magnetic hysterisis loop)で、磁性度の測定結果を示す。
2−1.超常磁性ナノ複合体を用いた全血(Whole blood)における赤血球(RBCs、Red blood cells)捕集実験
実施例1の超常磁性ナノ複合体の磁気分離能を確認するために、全血血液内で赤血球のみを捕集して分離後、分離能を確認する実験を進行させた。
赤血球の分離能(%)=捕集赤血球の数/(捕集赤血球の数+未捕集赤血球の数)×100
Claims (16)
- 鉄前駆体、溶媒、安定化剤、および還元剤を混合するステップと、
前記混合するステップで混合された溶液を、150〜300℃の温度および1.5〜10バー(bar)の圧力条件で水熱合成して、ナノクラスタ化された形態の超常磁性ナノ複合体を合成するステップと、
合成された超常磁性ナノ複合体を分離するステップとを含み、
前記安定化剤は、カルボキシ基を有する化合物であり、
前記超常磁性ナノ複合体は、0超過10nm以下の直径を有し、
カルボキシレート(COO−)基によって表面が安定化された磁性ナノクリスタルを含み、複数の磁性ナノクリスタルが凝集して、直径が100nm〜450nmのナノクラスタ化された形態を有し、水溶液で分散する親水性を有する超常磁性ナノ複合体を製造する方法。 - 前記分離された超常磁性ナノ複合体を極性溶媒で洗浄するステップをさらに含む、請求項1に記載の超常磁性ナノ複合体を製造する方法。
- 前記混合するステップで混合された溶液を、200〜240℃の温度および1.5〜6バー(bar)の圧力条件で水熱合成して、ナノクラスタ化された形態の超常磁性ナノ複合体を合成するものである、請求項1に記載の超常磁性ナノ複合体を製造する方法。
- 前記鉄前駆体は、塩化鉄六水和物(FeCl3・6H2O)、塩化鉄(II)、塩化鉄四水和物(II)、塩化鉄(III)、および硝酸鉄九水和物(Fe(NO3)3・9H2O)からなる群より選択された、請求項1に記載の超常磁性ナノ複合体を製造する方法。
- 前記溶媒は、エチレングリコール、ジエチレングリコール、トリエチレングリコール、テトラエチレングリコール、ジプロピレングリコール、およびグリセロールからなる群より選択された、請求項1に記載の超常磁性ナノ複合体を製造する方法。
- 前記安定化剤は、トリス−ソジウムシトレートジハイドレート(HOC(COONa)(CH2COONa)2・2H2O;C6H5Na3O7、および分子量500〜50,000のジカルボキシルポリ(エチレングリコール)からなる群より選択された、請求項1に記載の超常磁性ナノ複合体を製造する方法。
- 前記還元剤は、ソジウムアセテート、ソジウムアクリレート、尿素、ソジウムホルメート、およびアンモニウムアセテートからなる群より選択された、請求項1に記載の超常磁性ナノ複合体を製造する方法。
- 鉄前駆体と溶媒は、1:10〜1:300のモル比率で混合されるものである、請求項1に記載の超常磁性ナノ複合体を製造する方法。
- 鉄前駆体と安定化剤は、1:0.0000013〜1:1のモル比率で混合されるものである、請求項1に記載の超常磁性ナノ複合体を製造する方法。
- 鉄前駆体と還元剤は、1:1〜1:20のモル比率で混合されたものである、請求項1に記載の超常磁性ナノ複合体を製造する方法。
- 前記極性溶媒は、エタノール、水、メタノール、アセトン、液体アンモニア、酢酸エチル、エーテル、テトラヒドロフラン、水酸化カリウム、水酸化ナトリウム、およびジクロロメタンからなる群より選択された、請求項2に記載の超常磁性ナノ複合体を製造する方法。
- 前記分離された超常磁性ナノ複合体を極性溶媒で洗浄するステップは、前記分離された超常磁性ナノ複合体をエタノール溶媒を用いて洗浄するステップと、前記エタノール溶媒で洗浄された超常磁性ナノ複合体を水溶媒を用いて洗浄するステップとからなる、請求項2に記載の超常磁性ナノ複合体を製造する方法。
- 前記超常磁性ナノ複合体は、安定化剤のカルボキシレート(COO−)基によって水溶液での分散性が調節される、請求項1に記載の超常磁性ナノ複合体を製造する方法。
- 請求項1に記載の製造方法で製造される0超過10nm以下の直径を有し、カルボキシレート(COO−)基によって表面が安定化された磁性ナノクリスタルを含み、複数の磁性ナノクリスタルが凝集して、直径が100nm〜450nmのナノクラスタ化された形態を有し、水溶液で分散する親水性を有する超常磁性ナノ複合体。
- 前記磁性ナノクリスタルは、0超過10nm以下の直径を有するFe3O4である、請求項14に記載の超常磁性ナノ複合体。
- 0超過10nm以下の直径を有し、カルボキシレート(COO−)基によって表面が安定化されたFe3O4の磁性ナノクリスタルを含み、複数の磁性ナノクリスタルが凝集して、直径が100nm〜450nmのナノクラスタ化された形態を有し、水溶液で分散する親水性を有する超常磁性ナノ複合体。
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